I'm using Guice in my Eclipse application. In my architecture the
controller calls View's methods in order to update it: Eclipse (based
on the SWT Eclipse toolkit) requires calls to be performed in the
single GUI thread and provides specific API (similar to the Swing
EventQueue.invokeLater()), which may not be the case when I perform
long jobs in the background in another thread.
So my idea to avoid boiler plate code is to wrap View methods with
@SWTThread annotation and let the interceptor do the job. In the past
I've already an AspectJ aspect that does the job but making it benefit
of Guice injection is a bit hard and I thought I could use the same
approach with an AOP Alliance method interceptor which, instead, is
supported by Guice. So I've written something like :
public class SWTThreadInterceptor implements MethodInterceptor {
@Inject
private Provider<Display> displayProvider;
@Override
public Object invoke( final MethodInvocation invocation ) throws
Throwable {
// If we are in the SWT Thread then avoid wrapping (otherwise
the
interceptor will go in infinite
// recursive call)
Display display = displayProvider.get();
executeAsynch( display, invocation );
return null;
}
private void executeAsynch( Display display, final MethodInvocation
invocation ) {
display.asyncExec( new Runnable() {
public void run() {
try {
invocation.proceed();
} catch (Throwable e) {
throw new SWTThreadException( e );
}
}
});
}
}
My problem is that the invocation.proceed() method is invoked
recursively from within the UI thread! Anybody with more experience
may provide more insights? I guess that the proxied method is being
invoked again and again (instead of the actual class method, which is
invoked if I call invocation.proceed() directly) but don't know how to
access it (tried getThis() but had no luck).
Please help me! :)
Regards
Mario
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